testing/libsigc++3: new aport

https://github.com/libsigcplusplus/libsigcplusplus
Typesafe callback system for standard C++

testing/libsigc++3/APKBUILD

@@ -0,0 +1,34 @@
+# Contributor: Leo <thinkabit.ukim@gmail.com>
+# Maintainer: Leo <thinkabit.ukim@gmail.com>
+pkgname=libsigc++3
+pkgver=3.0.0
+pkgrel=0
+pkgdesc="Typesafe callback system for standard C++"
+url="https://github.com/libsigcplusplus/libsigcplusplus"
+arch="all"
+license="LGPL-3.0-or-later"
+makedepends="boost-dev"
+subpackages="$pkgname-dev"
+source="https://github.com/libsigcplusplus/libsigcplusplus/releases/download/$pkgver/libsigc++-$pkgver.tar.xz"
+builddir="$srcdir/libsigc++-$pkgver"
+
+build() {
+	./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--localstatedir=/var
+	make
+}
+
+check() {
+	make check
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="827831bd3d9aced63419e7616250ad7469db80dda101ad3b919e379e68fd54389e419093385b0fcfb695fc0f7ca954f5007bd747bf88a82090e649c2294a6d9b  libsigc++-3.0.0.tar.xz"